generate-gcc-cmake-toolchain.sh

#!/bin/bash
# Copyright lowRISC contributors.
# Licensed under the Apache License, Version 2.0, see LICENSE for details.
# SPDX-License-Identifier: Apache-2.0

## generate-gcc-cmake-toolchain.sh
#
# This generates a cmake-toolchains(7) file to configure CMake for
# cross-compiling with GCC.
#
# Docs: https://cmake.org/cmake/help/v3.15/manual/cmake-toolchains.7.html

set -e
set -x
set -o pipefail

if ! [ "$#" -ge 2 ]; then
  echo "Usage: $0 <target> <prefix_dir> <cflags...>"
  exit 2
fi;

## Take configuration from arguments
# This is the gcc target triple
toolchain_target="${1}"
# This is the directory where the toolchain has been installed.
toolchain_dest="${2}"
# Remaining cflags for build configurations
toolchain_cflags=("${@:3}")

cmake_cflags=""
for flag in "${toolchain_cflags[@]}"; do
  if [ -z "${cmake_cflags}" ]; then
    cmake_cflags+="${flag}";
  else
    cmake_cflags+=";${flag}"
  fi
done

config_dest="${toolchain_dest}/${toolchain_target}-gcc.cmake"
sysroot_config=""
system_name=""

case "${toolchain_target}" in
  riscv*-*-linux-gnu)
    system_name="Linux"
    sysroot_config="set(CMAKE_SYSROOT \"\${LOWRISC_TOOLCHAIN}/${toolchain_target}/sysroot\" CACHE STRING \"\" FORCE)";
  ;;
  riscv*-*-elf)
    system_name="Generic"
  ;;
esac;

tee "${config_dest}" <<CONFIG
# Autogenerated by ${0} on $(date -u)
# Problems? Bug reporting instructions in ${toolchain_dest}/buildinfo
#
# If you have relocated this toolchain, pass '-DLOWRISC_TOOLCHAIN=' to point to
# the new location of the toolchain when invoking CMake, before the -C argument
# which points to this file.

if(NOT LOWRISC_TOOLCHAIN)
  set(LOWRISC_TOOLCHAIN "${toolchain_dest}")
endif()

set(CMAKE_SYSTEM_NAME "${system_name}")
set(CMAKE_SYSTEM_PROCESSOR ${toolchain_target%%-*})

${sysroot_config}

set(CMAKE_C_COMPILER "\${LOWRISC_TOOLCHAIN}/bin/${toolchain_target}-gcc" CACHE STRING "" FORCE)
set(CMAKE_C_COMPILER_TARGET "${toolchain_target}" CACHE STRING "" FORCE)
set(CMAKE_C_COMPILER_EXTERNAL_TOOLCHAIN "\${LOWRISC_TOOLCHAIN}" CACHE STRING "" FORCE)
set(CMAKE_C_FLAGS "${cmake_cflags}" CACHE STRING "" FORCE)

set(CMAKE_CXX_COMPILER "\${LOWRISC_TOOLCHAIN}/bin/${toolchain_target}-g++" CACHE STRING "" FORCE)
set(CMAKE_CXX_COMPILER_TARGET "${toolchain_target}" CACHE STRING "" FORCE)
set(CMAKE_CXX_COMPILER_EXTERNAL_TOOLCHAIN "\${LOWRISC_TOOLCHAIN}" CACHE STRING "" FORCE)
set(CMAKE_CXX_FLAGS "${cmake_cflags}" CACHE STRING "" FORCE)

set(CMAKE_ASM_COMPILER "\${LOWRISC_TOOLCHAIN}/bin/${toolchain_target}-as" CACHE STRING "" FORCE)
set(CMAKE_ASM_COMPILER_TARGET "${toolchain_target}" CACHE STRING "" FORCE)
set(CMAKE_ASM_COMPILER_EXTERNAL_TOOLCHAIN "\${LOWRISC_TOOLCHAIN}" CACHE STRING "" FORCE)
set(CMAKE_ASM_FLAGS "${cmake_cflags}" CACHE STRING "" FORCE)

set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
CONFIG